/*
 *  FIPS-180-2 compliant SHA-384/512 implementation
 *
 *  Copyright The Mbed TLS Contributors
 *  SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
 *
 *  This file is provided under the Apache License 2.0, or the
 *  GNU General Public License v2.0 or later.
 *
 *  **********
 *  Apache License 2.0:
 *
 *  Licensed under the Apache License, Version 2.0 (the "License"); you may
 *  not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 *  **********
 *
 *  **********
 *  GNU General Public License v2.0 or later:
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 *  **********
 */
/*
 *  The SHA-512 Secure Hash Standard was published by NIST in 2002.
 *
 *  http://csrc.nist.gov/publications/fips/fips180-2/fips180-2.pdf
 */

#if !defined(MBEDTLS_CONFIG_FILE)
#include "nettls/config.h"
#else
#include MBEDTLS_CONFIG_FILE
#endif

#if defined(MBEDTLS_SHA512_C)

#include "nettls/sha512.h"
#include "nettls/platform_util.h"

#if defined(_MSC_VER) || defined(__WATCOMC__)
#define UL64(x) x##ui64
#else
#define UL64(x) x##ULL
#endif

#include <string.h>

#if defined(MBEDTLS_SELF_TEST)
#if defined(MBEDTLS_PLATFORM_C)
#include "nettls/platform.h"
#else
#include <stdio.h>
#include <stdlib.h>
#define mbedtls_printf printf
#define mbedtls_calloc calloc
#define mbedtls_free   free
#endif /* MBEDTLS_PLATFORM_C */
#endif /* MBEDTLS_SELF_TEST */

#define SHA512_VALIDATE_RET(cond) MBEDTLS_INTERNAL_VALIDATE_RET(cond, MBEDTLS_ERR_SHA512_BAD_INPUT_DATA)
#define SHA512_VALIDATE(cond)     MBEDTLS_INTERNAL_VALIDATE(cond)

#if !defined(MBEDTLS_SHA512_ALT)

/*
 * 64-bit integer manipulation macros (big endian)
 */
#ifndef GET_UINT64_BE
#define GET_UINT64_BE(n, b, i) \
    { \
        (n) = ((uint64_t)(b)[(i)] << 56) | ((uint64_t)(b)[(i) + 1] << 48) | ((uint64_t)(b)[(i) + 2] << 40) | ((uint64_t)(b)[(i) + 3] << 32) \
              | ((uint64_t)(b)[(i) + 4] << 24) | ((uint64_t)(b)[(i) + 5] << 16) | ((uint64_t)(b)[(i) + 6] << 8) | ((uint64_t)(b)[(i) + 7]); \
    }
#endif /* GET_UINT64_BE */

#ifndef PUT_UINT64_BE
#define PUT_UINT64_BE(n, b, i) \
    { \
        (b)[(i)] = (unsigned char)((n) >> 56); \
        (b)[(i) + 1] = (unsigned char)((n) >> 48); \
        (b)[(i) + 2] = (unsigned char)((n) >> 40); \
        (b)[(i) + 3] = (unsigned char)((n) >> 32); \
        (b)[(i) + 4] = (unsigned char)((n) >> 24); \
        (b)[(i) + 5] = (unsigned char)((n) >> 16); \
        (b)[(i) + 6] = (unsigned char)((n) >> 8); \
        (b)[(i) + 7] = (unsigned char)((n)); \
    }
#endif /* PUT_UINT64_BE */

void mbedtls_sha512_init(mbedtls_sha512_context* ctx)
{
    SHA512_VALIDATE(ctx != NULL);

    memset(ctx, 0, sizeof(mbedtls_sha512_context));
}

void mbedtls_sha512_free(mbedtls_sha512_context* ctx)
{
    if (ctx == NULL)
        return;

    mbedtls_platform_zeroize(ctx, sizeof(mbedtls_sha512_context));
}

void mbedtls_sha512_clone(mbedtls_sha512_context* dst, const mbedtls_sha512_context* src)
{
    SHA512_VALIDATE(dst != NULL);
    SHA512_VALIDATE(src != NULL);

    *dst = *src;
}

/*
 * SHA-512 context setup
 */
int mbedtls_sha512_starts_ret(mbedtls_sha512_context* ctx, int is384)
{
    SHA512_VALIDATE_RET(ctx != NULL);
    SHA512_VALIDATE_RET(is384 == 0 || is384 == 1);

    ctx->total[0] = 0;
    ctx->total[1] = 0;

    if (is384 == 0) {
        /* SHA-512 */
        ctx->state[0] = UL64(0x6A09E667F3BCC908);
        ctx->state[1] = UL64(0xBB67AE8584CAA73B);
        ctx->state[2] = UL64(0x3C6EF372FE94F82B);
        ctx->state[3] = UL64(0xA54FF53A5F1D36F1);
        ctx->state[4] = UL64(0x510E527FADE682D1);
        ctx->state[5] = UL64(0x9B05688C2B3E6C1F);
        ctx->state[6] = UL64(0x1F83D9ABFB41BD6B);
        ctx->state[7] = UL64(0x5BE0CD19137E2179);
    } else {
        /* SHA-384 */
        ctx->state[0] = UL64(0xCBBB9D5DC1059ED8);
        ctx->state[1] = UL64(0x629A292A367CD507);
        ctx->state[2] = UL64(0x9159015A3070DD17);
        ctx->state[3] = UL64(0x152FECD8F70E5939);
        ctx->state[4] = UL64(0x67332667FFC00B31);
        ctx->state[5] = UL64(0x8EB44A8768581511);
        ctx->state[6] = UL64(0xDB0C2E0D64F98FA7);
        ctx->state[7] = UL64(0x47B5481DBEFA4FA4);
    }

    ctx->is384 = is384;

    return (0);
}

#if !defined(MBEDTLS_DEPRECATED_REMOVED)
void mbedtls_sha512_starts(mbedtls_sha512_context* ctx, int is384)
{
    mbedtls_sha512_starts_ret(ctx, is384);
}
#endif

#if !defined(MBEDTLS_SHA512_PROCESS_ALT)

/*
 * Round constants
 */
static const uint64_t K[80] = {
    UL64(0x428A2F98D728AE22), UL64(0x7137449123EF65CD), UL64(0xB5C0FBCFEC4D3B2F), UL64(0xE9B5DBA58189DBBC), UL64(0x3956C25BF348B538),
    UL64(0x59F111F1B605D019), UL64(0x923F82A4AF194F9B), UL64(0xAB1C5ED5DA6D8118), UL64(0xD807AA98A3030242), UL64(0x12835B0145706FBE),
    UL64(0x243185BE4EE4B28C), UL64(0x550C7DC3D5FFB4E2), UL64(0x72BE5D74F27B896F), UL64(0x80DEB1FE3B1696B1), UL64(0x9BDC06A725C71235),
    UL64(0xC19BF174CF692694), UL64(0xE49B69C19EF14AD2), UL64(0xEFBE4786384F25E3), UL64(0x0FC19DC68B8CD5B5), UL64(0x240CA1CC77AC9C65),
    UL64(0x2DE92C6F592B0275), UL64(0x4A7484AA6EA6E483), UL64(0x5CB0A9DCBD41FBD4), UL64(0x76F988DA831153B5), UL64(0x983E5152EE66DFAB),
    UL64(0xA831C66D2DB43210), UL64(0xB00327C898FB213F), UL64(0xBF597FC7BEEF0EE4), UL64(0xC6E00BF33DA88FC2), UL64(0xD5A79147930AA725),
    UL64(0x06CA6351E003826F), UL64(0x142929670A0E6E70), UL64(0x27B70A8546D22FFC), UL64(0x2E1B21385C26C926), UL64(0x4D2C6DFC5AC42AED),
    UL64(0x53380D139D95B3DF), UL64(0x650A73548BAF63DE), UL64(0x766A0ABB3C77B2A8), UL64(0x81C2C92E47EDAEE6), UL64(0x92722C851482353B),
    UL64(0xA2BFE8A14CF10364), UL64(0xA81A664BBC423001), UL64(0xC24B8B70D0F89791), UL64(0xC76C51A30654BE30), UL64(0xD192E819D6EF5218),
    UL64(0xD69906245565A910), UL64(0xF40E35855771202A), UL64(0x106AA07032BBD1B8), UL64(0x19A4C116B8D2D0C8), UL64(0x1E376C085141AB53),
    UL64(0x2748774CDF8EEB99), UL64(0x34B0BCB5E19B48A8), UL64(0x391C0CB3C5C95A63), UL64(0x4ED8AA4AE3418ACB), UL64(0x5B9CCA4F7763E373),
    UL64(0x682E6FF3D6B2B8A3), UL64(0x748F82EE5DEFB2FC), UL64(0x78A5636F43172F60), UL64(0x84C87814A1F0AB72), UL64(0x8CC702081A6439EC),
    UL64(0x90BEFFFA23631E28), UL64(0xA4506CEBDE82BDE9), UL64(0xBEF9A3F7B2C67915), UL64(0xC67178F2E372532B), UL64(0xCA273ECEEA26619C),
    UL64(0xD186B8C721C0C207), UL64(0xEADA7DD6CDE0EB1E), UL64(0xF57D4F7FEE6ED178), UL64(0x06F067AA72176FBA), UL64(0x0A637DC5A2C898A6),
    UL64(0x113F9804BEF90DAE), UL64(0x1B710B35131C471B), UL64(0x28DB77F523047D84), UL64(0x32CAAB7B40C72493), UL64(0x3C9EBE0A15C9BEBC),
    UL64(0x431D67C49C100D4C), UL64(0x4CC5D4BECB3E42B6), UL64(0x597F299CFC657E2A), UL64(0x5FCB6FAB3AD6FAEC), UL64(0x6C44198C4A475817)};

int mbedtls_internal_sha512_process(mbedtls_sha512_context* ctx, const unsigned char data[128])
{
    int i;
    struct {
        uint64_t temp1, temp2, W[80];
        uint64_t A, B, C, D, E, F, G, H;
    } local;

    SHA512_VALIDATE_RET(ctx != NULL);
    SHA512_VALIDATE_RET((const unsigned char*)data != NULL);

#define SHR(x, n)  ((x) >> (n))
#define ROTR(x, n) (SHR((x), (n)) | ((x) << (64 - (n))))

#define S0(x) (ROTR(x, 1) ^ ROTR(x, 8) ^ SHR(x, 7))
#define S1(x) (ROTR(x, 19) ^ ROTR(x, 61) ^ SHR(x, 6))

#define S2(x) (ROTR(x, 28) ^ ROTR(x, 34) ^ ROTR(x, 39))
#define S3(x) (ROTR(x, 14) ^ ROTR(x, 18) ^ ROTR(x, 41))

#define F0(x, y, z) (((x) & (y)) | ((z) & ((x) | (y))))
#define F1(x, y, z) ((z) ^ ((x) & ((y) ^ (z))))

#define P(a, b, c, d, e, f, g, h, x, K) \
    do { \
        local.temp1 = (h) + S3(e) + F1((e), (f), (g)) + (K) + (x); \
        local.temp2 = S2(a) + F0((a), (b), (c)); \
        (d) += local.temp1; \
        (h) = local.temp1 + local.temp2; \
    } while (0)

    for (i = 0; i < 16; i++) {
        GET_UINT64_BE(local.W[i], data, i << 3);
    }

    for (; i < 80; i++) {
        local.W[i] = S1(local.W[i - 2]) + local.W[i - 7] + S0(local.W[i - 15]) + local.W[i - 16];
    }

    local.A = ctx->state[0];
    local.B = ctx->state[1];
    local.C = ctx->state[2];
    local.D = ctx->state[3];
    local.E = ctx->state[4];
    local.F = ctx->state[5];
    local.G = ctx->state[6];
    local.H = ctx->state[7];
    i = 0;

    do {
        P(local.A, local.B, local.C, local.D, local.E, local.F, local.G, local.H, local.W[i], K[i]);
        i++;
        P(local.H, local.A, local.B, local.C, local.D, local.E, local.F, local.G, local.W[i], K[i]);
        i++;
        P(local.G, local.H, local.A, local.B, local.C, local.D, local.E, local.F, local.W[i], K[i]);
        i++;
        P(local.F, local.G, local.H, local.A, local.B, local.C, local.D, local.E, local.W[i], K[i]);
        i++;
        P(local.E, local.F, local.G, local.H, local.A, local.B, local.C, local.D, local.W[i], K[i]);
        i++;
        P(local.D, local.E, local.F, local.G, local.H, local.A, local.B, local.C, local.W[i], K[i]);
        i++;
        P(local.C, local.D, local.E, local.F, local.G, local.H, local.A, local.B, local.W[i], K[i]);
        i++;
        P(local.B, local.C, local.D, local.E, local.F, local.G, local.H, local.A, local.W[i], K[i]);
        i++;
    } while (i < 80);

    ctx->state[0] += local.A;
    ctx->state[1] += local.B;
    ctx->state[2] += local.C;
    ctx->state[3] += local.D;
    ctx->state[4] += local.E;
    ctx->state[5] += local.F;
    ctx->state[6] += local.G;
    ctx->state[7] += local.H;

    /* Zeroise buffers and variables to clear sensitive data from memory. */
    mbedtls_platform_zeroize(&local, sizeof(local));

    return (0);
}

#if !defined(MBEDTLS_DEPRECATED_REMOVED)
void mbedtls_sha512_process(mbedtls_sha512_context* ctx, const unsigned char data[128])
{
    mbedtls_internal_sha512_process(ctx, data);
}
#endif
#endif /* !MBEDTLS_SHA512_PROCESS_ALT */

/*
 * SHA-512 process buffer
 */
int mbedtls_sha512_update_ret(mbedtls_sha512_context* ctx, const unsigned char* input, size_t ilen)
{
    int ret;
    size_t fill;
    unsigned int left;

    SHA512_VALIDATE_RET(ctx != NULL);
    SHA512_VALIDATE_RET(ilen == 0 || input != NULL);

    if (ilen == 0)
        return (0);

    left = (unsigned int)(ctx->total[0] & 0x7F);
    fill = 128 - left;

    ctx->total[0] += (uint64_t)ilen;

    if (ctx->total[0] < (uint64_t)ilen)
        ctx->total[1]++;

    if (left && ilen >= fill) {
        memcpy((void*)(ctx->buffer + left), input, fill);

        if ((ret = mbedtls_internal_sha512_process(ctx, ctx->buffer)) != 0)
            return (ret);

        input += fill;
        ilen -= fill;
        left = 0;
    }

    while (ilen >= 128) {
        if ((ret = mbedtls_internal_sha512_process(ctx, input)) != 0)
            return (ret);

        input += 128;
        ilen -= 128;
    }

    if (ilen > 0)
        memcpy((void*)(ctx->buffer + left), input, ilen);

    return (0);
}

#if !defined(MBEDTLS_DEPRECATED_REMOVED)
void mbedtls_sha512_update(mbedtls_sha512_context* ctx, const unsigned char* input, size_t ilen)
{
    mbedtls_sha512_update_ret(ctx, input, ilen);
}
#endif

/*
 * SHA-512 final digest
 */
int mbedtls_sha512_finish_ret(mbedtls_sha512_context* ctx, unsigned char output[64])
{
    int ret;
    unsigned used;
    uint64_t high, low;

    SHA512_VALIDATE_RET(ctx != NULL);
    SHA512_VALIDATE_RET((unsigned char*)output != NULL);

    /*
     * Add padding: 0x80 then 0x00 until 16 bytes remain for the length
     */
    used = ctx->total[0] & 0x7F;

    ctx->buffer[used++] = 0x80;

    if (used <= 112) {
        /* Enough room for padding + length in current block */
        memset(ctx->buffer + used, 0, 112 - used);
    } else {
        /* We'll need an extra block */
        memset(ctx->buffer + used, 0, 128 - used);

        if ((ret = mbedtls_internal_sha512_process(ctx, ctx->buffer)) != 0)
            return (ret);

        memset(ctx->buffer, 0, 112);
    }

    /*
     * Add message length
     */
    high = (ctx->total[0] >> 61) | (ctx->total[1] << 3);
    low = (ctx->total[0] << 3);

    PUT_UINT64_BE(high, ctx->buffer, 112);
    PUT_UINT64_BE(low, ctx->buffer, 120);

    if ((ret = mbedtls_internal_sha512_process(ctx, ctx->buffer)) != 0)
        return (ret);

    /*
     * Output final state
     */
    PUT_UINT64_BE(ctx->state[0], output, 0);
    PUT_UINT64_BE(ctx->state[1], output, 8);
    PUT_UINT64_BE(ctx->state[2], output, 16);
    PUT_UINT64_BE(ctx->state[3], output, 24);
    PUT_UINT64_BE(ctx->state[4], output, 32);
    PUT_UINT64_BE(ctx->state[5], output, 40);

    if (ctx->is384 == 0) {
        PUT_UINT64_BE(ctx->state[6], output, 48);
        PUT_UINT64_BE(ctx->state[7], output, 56);
    }

    return (0);
}

#if !defined(MBEDTLS_DEPRECATED_REMOVED)
void mbedtls_sha512_finish(mbedtls_sha512_context* ctx, unsigned char output[64])
{
    mbedtls_sha512_finish_ret(ctx, output);
}
#endif

#endif /* !MBEDTLS_SHA512_ALT */

/*
 * output = SHA-512( input buffer )
 */
int mbedtls_sha512_ret(const unsigned char* input, size_t ilen, unsigned char output[64], int is384)
{
    int ret;
    mbedtls_sha512_context ctx;

    SHA512_VALIDATE_RET(is384 == 0 || is384 == 1);
    SHA512_VALIDATE_RET(ilen == 0 || input != NULL);
    SHA512_VALIDATE_RET((unsigned char*)output != NULL);

    mbedtls_sha512_init(&ctx);

    if ((ret = mbedtls_sha512_starts_ret(&ctx, is384)) != 0)
        goto exit;

    if ((ret = mbedtls_sha512_update_ret(&ctx, input, ilen)) != 0)
        goto exit;

    if ((ret = mbedtls_sha512_finish_ret(&ctx, output)) != 0)
        goto exit;

exit:
    mbedtls_sha512_free(&ctx);

    return (ret);
}

#if !defined(MBEDTLS_DEPRECATED_REMOVED)
void mbedtls_sha512(const unsigned char* input, size_t ilen, unsigned char output[64], int is384)
{
    mbedtls_sha512_ret(input, ilen, output, is384);
}
#endif

#if defined(MBEDTLS_SELF_TEST)

/*
 * FIPS-180-2 test vectors
 */
static const unsigned char sha512_test_buf[3][113] = {
    {"abc"},
    {"abcdefghbcdefghicdefghijdefghijkefghijklfghijklmghijklmn"
     "hijklmnoijklmnopjklmnopqklmnopqrlmnopqrsmnopqrstnopqrstu"},
    {""}};

static const size_t sha512_test_buflen[3] = {3, 112, 1000};

static const unsigned char sha512_test_sum[6][64] = {
    /*
     * SHA-384 test vectors
     */
    {0xCB, 0x00, 0x75, 0x3F, 0x45, 0xA3, 0x5E, 0x8B, 0xB5, 0xA0, 0x3D, 0x69, 0x9A, 0xC6, 0x50, 0x07, 0x27, 0x2C, 0x32, 0xAB, 0x0E, 0xDE, 0xD1, 0x63,
     0x1A, 0x8B, 0x60, 0x5A, 0x43, 0xFF, 0x5B, 0xED, 0x80, 0x86, 0x07, 0x2B, 0xA1, 0xE7, 0xCC, 0x23, 0x58, 0xBA, 0xEC, 0xA1, 0x34, 0xC8, 0x25, 0xA7},
    {0x09, 0x33, 0x0C, 0x33, 0xF7, 0x11, 0x47, 0xE8, 0x3D, 0x19, 0x2F, 0xC7, 0x82, 0xCD, 0x1B, 0x47, 0x53, 0x11, 0x1B, 0x17, 0x3B, 0x3B, 0x05, 0xD2,
     0x2F, 0xA0, 0x80, 0x86, 0xE3, 0xB0, 0xF7, 0x12, 0xFC, 0xC7, 0xC7, 0x1A, 0x55, 0x7E, 0x2D, 0xB9, 0x66, 0xC3, 0xE9, 0xFA, 0x91, 0x74, 0x60, 0x39},
    {0x9D, 0x0E, 0x18, 0x09, 0x71, 0x64, 0x74, 0xCB, 0x08, 0x6E, 0x83, 0x4E, 0x31, 0x0A, 0x4A, 0x1C, 0xED, 0x14, 0x9E, 0x9C, 0x00, 0xF2, 0x48, 0x52,
     0x79, 0x72, 0xCE, 0xC5, 0x70, 0x4C, 0x2A, 0x5B, 0x07, 0xB8, 0xB3, 0xDC, 0x38, 0xEC, 0xC4, 0xEB, 0xAE, 0x97, 0xDD, 0xD8, 0x7F, 0x3D, 0x89, 0x85},

    /*
     * SHA-512 test vectors
     */
    {0xDD, 0xAF, 0x35, 0xA1, 0x93, 0x61, 0x7A, 0xBA, 0xCC, 0x41, 0x73, 0x49, 0xAE, 0x20, 0x41, 0x31, 0x12, 0xE6, 0xFA, 0x4E, 0x89, 0xA9,
     0x7E, 0xA2, 0x0A, 0x9E, 0xEE, 0xE6, 0x4B, 0x55, 0xD3, 0x9A, 0x21, 0x92, 0x99, 0x2A, 0x27, 0x4F, 0xC1, 0xA8, 0x36, 0xBA, 0x3C, 0x23,
     0xA3, 0xFE, 0xEB, 0xBD, 0x45, 0x4D, 0x44, 0x23, 0x64, 0x3C, 0xE8, 0x0E, 0x2A, 0x9A, 0xC9, 0x4F, 0xA5, 0x4C, 0xA4, 0x9F},
    {0x8E, 0x95, 0x9B, 0x75, 0xDA, 0xE3, 0x13, 0xDA, 0x8C, 0xF4, 0xF7, 0x28, 0x14, 0xFC, 0x14, 0x3F, 0x8F, 0x77, 0x79, 0xC6, 0xEB, 0x9F,
     0x7F, 0xA1, 0x72, 0x99, 0xAE, 0xAD, 0xB6, 0x88, 0x90, 0x18, 0x50, 0x1D, 0x28, 0x9E, 0x49, 0x00, 0xF7, 0xE4, 0x33, 0x1B, 0x99, 0xDE,
     0xC4, 0xB5, 0x43, 0x3A, 0xC7, 0xD3, 0x29, 0xEE, 0xB6, 0xDD, 0x26, 0x54, 0x5E, 0x96, 0xE5, 0x5B, 0x87, 0x4B, 0xE9, 0x09},
    {0xE7, 0x18, 0x48, 0x3D, 0x0C, 0xE7, 0x69, 0x64, 0x4E, 0x2E, 0x42, 0xC7, 0xBC, 0x15, 0xB4, 0x63, 0x8E, 0x1F, 0x98, 0xB1, 0x3B, 0x20,
     0x44, 0x28, 0x56, 0x32, 0xA8, 0x03, 0xAF, 0xA9, 0x73, 0xEB, 0xDE, 0x0F, 0xF2, 0x44, 0x87, 0x7E, 0xA6, 0x0A, 0x4C, 0xB0, 0x43, 0x2C,
     0xE5, 0x77, 0xC3, 0x1B, 0xEB, 0x00, 0x9C, 0x5C, 0x2C, 0x49, 0xAA, 0x2E, 0x4E, 0xAD, 0xB2, 0x17, 0xAD, 0x8C, 0xC0, 0x9B}};

/*
 * Checkup routine
 */
int mbedtls_sha512_self_test(int verbose)
{
    int i, j, k, buflen, ret = 0;
    unsigned char* buf;
    unsigned char sha512sum[64];
    mbedtls_sha512_context ctx;

    buf = mbedtls_calloc(1024, sizeof(unsigned char));
    if (NULL == buf) {
        if (verbose != 0)
            mbedtls_printf("Buffer allocation failed\n");

        return (1);
    }

    mbedtls_sha512_init(&ctx);

    for (i = 0; i < 6; i++) {
        j = i % 3;
        k = i < 3;

        if (verbose != 0)
            mbedtls_printf("  SHA-%d test #%d: ", 512 - k * 128, j + 1);

        if ((ret = mbedtls_sha512_starts_ret(&ctx, k)) != 0)
            goto fail;

        if (j == 2) {
            memset(buf, 'a', buflen = 1000);

            for (j = 0; j < 1000; j++) {
                ret = mbedtls_sha512_update_ret(&ctx, buf, buflen);
                if (ret != 0)
                    goto fail;
            }
        } else {
            ret = mbedtls_sha512_update_ret(&ctx, sha512_test_buf[j], sha512_test_buflen[j]);
            if (ret != 0)
                goto fail;
        }

        if ((ret = mbedtls_sha512_finish_ret(&ctx, sha512sum)) != 0)
            goto fail;

        if (memcmp(sha512sum, sha512_test_sum[i], 64 - k * 16) != 0) {
            ret = 1;
            goto fail;
        }

        if (verbose != 0)
            mbedtls_printf("passed\n");
    }

    if (verbose != 0)
        mbedtls_printf("\n");

    goto exit;

fail:
    if (verbose != 0)
        mbedtls_printf("failed\n");

exit:
    mbedtls_sha512_free(&ctx);
    mbedtls_free(buf);

    return (ret);
}

#endif /* MBEDTLS_SELF_TEST */

#endif /* MBEDTLS_SHA512_C */
